Immanuel Kant Quote Question 2 from my homework

I need to know what is the following quote main idea and why does he present this main idea

" The will is thus not merely subject to the law but is subject to the law in such a way that it must be regarded also as legislating for itself and only on this account as being subject to the law "of which it can regard itself as the author)

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In this sense the will is man, man can\'t just follow the law (law as refering to the ultimate power/God\'s laws/God\'s rule of natural laws). It should be seen as being determined by the law ...